Rena fine mesh filter pouches can be used in all aquarium and pond filter systems. Each bag is 7-/12 square with reclosable draw string. Use with any brand of carbon, zeolite or other filtration material in both fresh and saltwater systems. This size is an ideal fit for most aquarium filters. The fine mesh prevents media leakage and bags are tough enough to use many time before replacing. Packed in a convenient 2 pack.
